However, the diameter of the observable universe is said to be over 900 billion light-years, right? Oh yes, the Beijing ...

(via Sabine Hossenfelder) Is the universe really infinite? Or could it close back on itself like a sphere? If it’s infinite, how can it expand? And is it true that there might be copies of you in it?

When you bake a loaf of bread or a batch of muffins, you put the dough into a pan. As the dough bakes in the oven, it expands into the baking pan. Any chocolate chips or blueberries in the muffin ...

Modern cosmology reveals a universe expanding uniformly without a spatial center or edge. The Big Bang wasn't a localized ...

The multiverse has become scientists’ favorite explanation for the remarkable fine-tuning of the universe. The idea is simple ...

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So what does the edge of the universe look like? At first, I thought it might be like Earth’s atmosphere, where outside is just vacuum. But then I learned it’s not like that a ...

Whenever we look out at the Universe, no matter how powerful our tools or how clever our techniques, there’s always a limit to what we’re capable of observing. No photons, or quanta of light, can be ...